LHC Interaction Region Quadrupole Conceptual Design Review Fermilab December 3, 1998

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LHC Interaction Region QuadrupoleConceptual
Design ReviewFermilabDecember 3, 1998
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Scope of the cryostat design and production effort

• Vacuum vessel, external supports, and alignment
  fiducials.
• Thermal radiation shields and intermediate
  temperature intercepts.
• Multi-layer insulation system.
• Suspension and anchor systems.
• Cryogenic piping.
• Cold mass end domes.
• Interconnecting bellows, shield bridges, and
  vacuum relief devices.
• Incorporation of interconnect hardware, e.g.
  correctors, absorbers, and beam position
  monitors.
• Accommodate cold masses from Fermilab and KEK.
• Shipping restraints (if required).

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Triplet layout from optics
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Structural, alignment, and thermal design criteria
Heat loads are per triplet.
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Single SSC-style support
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CERN arc dipole support
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Two truss-style supports
External heat exchanger
Vacuum vessel
Support post
70K shield
MLI
Cold masses
Vessel stiffener
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Single vs. double support post suspension system
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Cryostat cross section with spider support
Vacuum vessel
Pumping line
Cold mass and
piping support
spider
50-70K shield
Cold mass slides
MLI
4.5K supply/return
Stiffener
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IRQ cryostat end view
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IRQ cryostat spider support
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Support to cold mass connection
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Thermal FEA analysis - temperature distribution
Heat loads per cryostat (supports
only) 1.8K 9.0W 4.5K 5.0W 60K 50W
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Structural FEA analysis - cooldown 1g vertical
(dx)
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Structural FEA analysis - cooldown 1g (dy)
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Structural FEA analysis - cooldown 1g (equiv
stress)
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Structural FEA analysis - 2g lateral (ux)
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Structural FEA analysis - 2g lateral (equiv
stress)
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Structural FEA analysis - 2g lateral (equiv
stress)
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Cryostat pipe sizes
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Cryogenic piping pressures and flows
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Interconnect component positions and physical
parameters
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Cryostat interface milestone summary
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Cryostat interface milestone summary (continued)
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Planned RD activities

• Full scale heat exchanger test at CERN.
• Full scale support system structural test at
  Fermilab. We have no plans to do any thermal
  testing to verify the predicted heat leak of the
  support system.
• Research, selection, and test of suitable
  support-to-cold mass sliding interface designs
  and materials.
• Design, construction, instrumentation, and test
  of a full-scale prototype magnet and cryostat
  (probably a Q1) beginning at the end of 1999.

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Goals of the heat exchanger test

• First opportunity for new personnel to become
  familiar with the design of cryogenic vessels.
• Study the external heat exchanger performance at
  all operating conditions from static to full
  dynamic load.
• Study the performance at all tunnel slope
  conditions.
• Study the need for weir walls inside the
  corrugated tube.
• Study the cryogenic control systems at various
  operating conditions.

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Heat exchanger test module (1 of 4)
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Heat exchanger test module inner assembly
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Heat exchanger test feedbox (vacuum vessel and
shield removed)
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Cold mass support test fixture - vertical load
configuration
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Cold mass support test fixture - horizontal load
configuration
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Prototype magnet

• Design, construction, instrumentation, and test
  of a full-scale prototype magnet and cryostat
  (probably a Q1) beginning at the end of 1999.
• Assembly procedure development and refinement
  (travelers).
• Assembly tooling shakedown.
• MTF test stand shakedown.
• Magnet interconnect shakedown.
• Heat leak test (maybe).
• Alignment stability studies.
• Shipping and handling studies after testing.

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Concerns

• Competition between the RD program and the
  mainstream design, especially vendor follow-up on
  the heat exchanger test.
• Freezing the design of non-Fermilab supplied
  interconnect components, especially BPMs,
  correctors, and beam tube details.
• Interconnection of the Q2a and Q2b.
• Coordination between Fermilab and KEK to
  standardize the cold mass mechanical and
  electrical connections and the end dome weld
  details.
• Availability of engineering resources especially
  early in the design program.